Blizzard Global Community Director Adam "Pezradar" Fletcher confirmed this was fixed earlier this week in addition to bans/suspensions to users who fully abused this exploit.
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Diablo 4 Seasonal Exploit Confirmed Fixed by Blizzard – Bans Issued
Blizzard has confirmed that earlier this week they fixed a major exploit bug that allowed Seasonal and Eternal characters to group up and trade. This has led to a major inflation of the trading markets as well as allowed Seasonal items to be used by Eternal characters.